Exclude target when equal to min for responses (attempt 2)

Author: r4victor

src/dstack/_internal/core/models/fleets.py

@@ -168,7 +168,7 @@ def dict(self, *args, **kwargs) -> Dict:
         res = CoreModel.dict(self, *args, **kwargs)
         # For backward compatibility with old clients
         # that do not ignore extra fields due to https://github.com/dstackai/dstack/issues/3066
-        if hasattr(res, "target") and res["target"] == res["min"]:
+        if "target" in res and res["target"] == res["min"]:
             del res["target"]
         return res